1998 HONDA CR-V sensor system

ABS Control Unit Terminal Arrangement
ABS CONTROL UNIT 26P CONNECTOR
Wire side of female terminals
TeiminalnumbelWiiecolorTerminal3ignTeiminalnamglDescription
Voltrge
tdminalsCondhions(lgnition Switch ON llll)Output voltago
1GRNn/VHTPCOM(Primary
common)
Power source for the solenoidvalve and pump motor.1-GNDON6
ONOV
OFFAC:3-6V
2BLI(WHTSCOM(Secondary
common)
Power source for the solenoid2-GNDOFF
lConnect the SCS seNice] connector IApprox.3 V
BLVBLU(lgnition 2)Detects ignition switch 2signal. (System activate signal)3-GNDBattery Voltage
4BLUA/ELRRO(Rear-right 0)Detocts right-rear wheelsensor srgnat.When the wheel isturned at 1 turn/second.
53 mV or above ondigitaltester (ACrange) {Beference)150 mvtrp or aboveon oscilloscope
GRYRLO(Rear-left 0)Detects left-rear wheel sensorsrgnat.6-19
8GRNFRO(Fronr-right 0)Detects right-front wheelsensor signal.8-21StopsApprox.2.5 VSTOP
{Stop)Detects bfake switch signal.(Prevents unnecessary ABS operation)9-GNDBrake pedal pressed.Battery Voltage
Brake Dedal released.OV
10BRN^/VHTFLO(Front-left 0)
Detects left-front wheel sensorsrgnal.
10-23
When the wheel isturned at 1 turn/second.
53 mV or above ondigitaltester lACrange) (Reference)
150 mvpp or aboveon oscilloscope
StopsADprox. 2.5 V
YELRL-oUT(Rearleft outlet)
Drives left-rear outlet solenoid12.GNDONONOV
OFFAC:3-6V
13RED^/vHTRR.IN(Rear-right
inlet)
Drives right-rear inlet solenoid13.GNDOFF
lConnect the SCS service\ connector IApprox. 3 V
14WHT/GRNB1(Baftery 1)Power source for the solenoidvalve and pump motor.14.GND
Every timeBattery Voltage82(Battery 2)Power source for the solenoidvalve and pump motor.15-GND
16BLKGND2(Ground 2)Ground for the ABS controlunit.16-GNDBelow 0.3 V
't7GRN/YELRR1(Rear-right 1)Detects right-rear wheelsensor signal.'t7 -4
When the wheel is turnedat l turn/second,
53 mV or aboveon digitaltester(AC range)(Reference) 150mVp-p or aboveon oscilloscope
19LT BLURL1(Rearieft 1)Detects left-rear wheel sensorsignal.19-6
GRN/BLKFR1(Front-right 1)Detects right-front wheelsensor srgnat.21-8
23GBN/ORNFL1{Front-left 1}Detects left-front wheel sensorsagnal.23-10StopsApprox. 2.5 V
REDRLI N(Rear-left inlet)
Drives left-rear inlet solenoid
25,GND
ON
=
-9ONOV
AC:3-6V
OFF
/Connect the SCS service] conneclor IApprox. 3 V
26BLKGND3(Gtound 3)Ground tor the ABS controluntI.26-GNDBelow 0.3 V
19-34
www.emanualpro.com

Troubleshooting Precautions
ABS lndicalor
1 lf the system is oK, the ABS indicator goes off two seconds after turning the ignition switch oN 1l) wathout staningthe engine, and then comes on again and goes off after two seconds. This occurs because the ABS control unit isturned on by the lG2 power source.2. The ABS indicator comes on when the ABS control unit detects a problem in the system. However, even thouoh thesystem is operating properly, the ABs indicator will come on too, under the following conditions:. Signal disturbance
. Wheel spin
. Only drive wheels rotate. Battery voltage fluctuates
To determine the actual cause of the problem, question the customer about the problem, taking these conditions intoconsideration:
3 When a problem is detected and the ABS indicator comes on, the indicator can stay on until the ignition switch isturned OFF, or it can automatically go off, depending on the mode.. Indicator stays on untilthe ignition switch is turned off: When the system is in the system down mode.. Indicator automatically goes off: When the system is in the control inhibition mode.4 The ABS indicator stays on when the system is reactivated without erasing the DTC, but it goes off after starting thevehicle.
When the wheel sensor system is faulty and the ABS indicator comes on. the algorithm of the system automatically turnsoff the ABS indicator after the wheel speed signal returns to the normal speed. Also, when the DTc is erased, the cpu isreset and the ABS indicator goes off when the system checked out normal by the initial diagnosis.Therefore, test-drive the vehicle after servicing the wheel sensor system. and be sure that the ABS indicator does notcome on.
5 When the ABS control unit outputs battery voltage to the gauge assembly, the ABS indicator ooes off.
Diagnostic Trouble Code (DTCI
1. The diagnostic trouble code (DTc) is memorized when a problem is detected and the ABS indicator does not go off,or when the ABS indicator comes on.The DTc is not memorized when the ABS indicator comes on unress the cpu is activated,2 The memory can hold any number of DTCs. However, when the same DTc is detected twice or more, the tater one iswritten over the old one.
Therefore, when the same problem is detected repeatedly, it is recorded as one DTC.3. The DTCs are indicated in the order of ascending number, not in the order they occur.4. The DTCS are memorized in the EEPROM (non-volatile memorv).Therefore, the memorized DTcs cannot be canceled by disconnecting the battery. perform the specified procedures toerase the DTCS.
Self-diagnosis
1. Self-diagnosis can be classified into these four categories:' Initial diagnosis: Performed right after the eng ine starts and untir theABS indicator goes off.. Except ABS control: Performed when the ABS is not functioning.. During ABS control: Performed when the ABS is functioning.. During warning: Performed when the ABS indicator is ON.2. The system performs the fo|owing contrors when a probrem is detected by the serf-diagnosis:. ABS indicator ON. Memorv of DTC. Mode changetothe "system down mode,, or the ,,control inhibition mode,,.
MODEABS INDICATORMAIN
RELAY
SOLENOID
VALVECPURestart conditionDTC
SYSTEM
DOWNONNo
operation
Drive
inhibitionOperation*rlgnition
switchoFF - ON l)Memory
CONTROL
INHIBITIONONNo
operal|on
Drive
inhibitionOperationAutomaticlMemory
*1: Except CPU failure
19-36
www.emanualpro.com

Evaporator
Replacement
1.Recover the refrigerant with a recovery/recycling/
charging station (see page 22-59).
Remove the battery.
Remove each bolt, then disconnect the suction and
receiver lines from the evaporator. Plug or cap the
lines immediately after disconnecting them to avoid
moisture and dust contamination,
RECEIVER LINE
..
\
6x1.0mm9.8 N'm (1.0 kgf m,7.2 tbl.ttl
Remove the glove box (see section 20).
Remove the self-tapping screw and the passenger's
dashboard lower cover, then remove the bolts and
the glove box frame together with the knee bolster.
GLOVE BOX FRAME
KNEE
22-44
6. Disconnect the connector from the evaoorator tem-
oerature sensor. and remove the wire harness from
the evaporator. Remove the self-tapping screws, the
mounting bolt and the mounting nut. Disconnect
the drain hose, then remove the evaporator.
5xl,0mm9.8 N.m {1.0
II
I
Io
kgf.m, 7.2 lbf.ftl
, -l: "
7.
EVAPORATOR
6x1.0mm9.8 N.m (1.0 kgtm,7.2lbf.ftl
Install in the reverse order of removal, and note of
these items.
. lf you're installing a new evaporator, add refrig-
erant oil (SP.10) (see page 22-541.
Replace the O-rings with new ones at each fit-
ting, and apply a thin coat of refrigerant oil
before installing them. Be su.e to use the right
O-rings for HFC-134a (R-134alto avoid leakage.
Apply sealant to the grommets.
Make sure that there is no air Ieakage.
Charge the system (see page 22-6'll, and test its
performance (see page 22-56]-,
a
a
a
www.emanualpro.com

A/C System Service
Pressure Test Chart
NOTE: Performance Test is on page 22-56.
Test resultsRelatad symptomsPrcbable caus€Remody
Discharge (high)pressure 6bnormallyhagh
After stopping compressor, pressuredrops to about 200 kPa 12.0 kgtlcm,,28 psi) quickly, and then lalls gradualty.
Air in systemDischarge, evacuate, and rechargewith specified amount.Evacuation: see page 22-60Charging: see page 22-61No bubbles in sight glass whencondenser is cooled by waterExcessive refrigerant in systemDischarge, evacuate, and rechargewith specilied amount.Reduced or no air flow throughcondenser. Clogged condenser or radia-tor fins. Condenser or radiator fannot wo.king properly
CleanCheck voltage and fan rpm.Check fan direction.
Line to condensor is excossivelv hot.Restricted flow of relrigerant insy$emFestricted lines
Discharge pressureabnormally lowExcessive bubbles in sight glass;condenser is not hot.Insufficient retrigerant inCheck for leak.Charge system.High and low pressures are balancedsoon after stopping compressor. Lowside is higher than normal.
. Faulty compressor discharge
. Faulty compressor seal
Replace the comprossor.
Outlet ot expansion valve is notfrosted, low-pressure gauge indicates
' Faulty expansion valve. Moisture in system. Replace. Discharge, evacuate, andrecharge with specified amount.Suction {low) pros,sure abnormallyExcessive bubbles in sight glass;condenser is not hot.Insufficiont relrigerant inRepair the leaks.Discharge, evacuate, andrecharge with specified amount.Charge as r€quired.Expansion valve is not frosted, andlow-pressure line is not cold. Low-pressure gauge indicates vacuum.
' Frozen expansion valvelMoisture in system). Faulty expansion valve
. Discharge, evacuate, andrecharge with specitied amount.. Replace th€ expansion valve.Discharge temperature is low, and theair llow trom vents is restricted.Frozen evaporatorRun the fan with compressor off,then check evaporator tempera,ture sensor.Expansion valve is frosted.Clogged expansion valveClean or replace.Feceiver/dryer outlet is cool, and inlotrs w6rm (should be warm duringoperation).
Clogged receiver/dryerReplace
Suction pressureabnormally highLow-pressure hose and check joint arecooler than tho temperature aroundevaporator.
. Expansion valve open too long. Loose expansion capillarytube
Repair or roplace.
Suction pressure is lowored whencondenser is cooled by water.Excessive refrigerant in systemDischarge, evacuate, and rechargewath specified amount.High and low-pressure are equalizedas soon as tho compressor is stopped,and both gauges tluctuate whilerunning.
Faulty gasketFaulty high-pressure valveForeign panicle stuck in high-
Replace the compressor.
Slction and dis,charge pressutesabnormally high
Reduced air flow through condens€r,. Clogged condenser orradiator tins. Condenser or radiator fannot working properly
CleanCheck voltage and fan rpm.Check Ian direction.
No bubbles in sight glass whencondenser is cooled by walerExcessive refrigerant jn systemDischarge, evacuate, and rechargewith specified amount.Suction and dis-charge pressureabnormally low
Low-pressure hose and motalendareas are cooterlhan evaporator.Clogged or kinked low-pressure hose pansRepair or replace.
Temperature around expansion valvers too low compared with that aroundClogged high-pressure lineRepair or replace.
Refrigerant leaksCompressor clutch is diny.Compressor shaft seal leakingReplace the compressor.Compressor boltls) are dirty.Leaking around bolt(s)Tighton bolt{s) or replacecompressor.Compressor gasket is wet with oil.Gasket leakingReplace the compressor,
www.emanualpro.com

Connector ldentification and Wire Harness Routing
Main Wire Harn€ss (left side of dash and floor branchesl {cont,dl
c401
c402
c403
c404
c404
c405
c406
c407
c408
c409
c410
c410
c411
c412
c413
c413
c414
c415
c416
c416
c417
c418
c419
c420
c420
c421
c422
c423
c424
c425
c42A
c426
c437
c438
c438
c439
c440
c441c442
5
20
20
24
't4
8
5
3
12
10'1
18
20'18
10
15
1
4
8
5
5
22
Behind left kick panel
Behind left kick panel
Behind left kick panel
Behind left kick panel
Behind left kick panel
Under left side of dashUnder left side of dashUnder left side of dashUnder left side of dashUnder left side of dashUnder left side of dashUnder left side of dash
Under left side of dashUnder left side of dashUnder left side of dash
Under left side of dash
Under left side of dashUnder left side of dashUnder left side of dashUnder left side of dashUnder left side of dashUnder left side of dashUnder left side of dashUnder left side of dash
Under left side of dashUnder left side of dashUnder left side of dashUnder middle of dashUnder middle of dashUnder middle of dashUnder middle of dashUnder middle of dash
Under left side of dashUnder left side of dash
Under left side of dashUnder left side of dashUnder left side of dashUnder left side of dashUnder left side of dash
Under left side of dash
Under left side of dashUnder left side of dashUnder left side of dashUnder left side of dash
Starter cut relay
Horn relay
Left side wire harness (C558)
Left side wire harness (C559)
Left side wire harness (C559)
Cruise control unitDaytime running lights control unitDaytime running lights control unitlgnition key light control unitInterior wire harness {C701)Cable reel
Cable reel
lgnition key switchlgnition key switch
Combination switch sub-harness {C753)
Combination switch sub-harness (C753)
SRS main harness (C803)
Dashboard wire harness (C503)
Dashboard wire harness (C501)
Dashboard wire harness {C501)Under-dash fuse/relay box (C922)
Under-dash fuse/relay box (C920)
Under-dash fuse/relay box (C919)
lntegrated control unit
Integrated control unitFront fog lights switchBrake switch
Interlock control unitReverse relay
Rear accessory socket relayRear accessory socket relayRear heated oxygen sensor sub-harness (C722)
Security control unitSecurity starter cut relay (for securityalarm system)
Junction connector (for interlock system)Security wire harnessSecurity wire harnessRear window wiper control unitCombination switch sub-harness (C760)
Combination switch sub-harness (C760)
Securlty indicatorSecurity valet switchClutch interlock switchClutch switch (for cruise control)
'97 model'98 - 00mooets
Canada
Canada'97 model
'97 model'98 - 00models
'97 - 98models'99 - 00
moqets
'97 model'98 - 00mooets
Optional
Optional
Optional
Optional
Optional'97 model
'97 - 98mooels'99 - 00models
OptionalOptional
Mfi
Mlr
Under left side of dashBody ground, via main wire harness
23-20
www.emanualpro.com

Connector ldentification and Wire Harness Routing
Left Side Wire Harness
Connector oI
Terminal
Number of
CavitiesLocaiionConnects toNot6s
c551
c552
c554
c556
c558
c559
c559
c560
c562
c563
c563
c564
c565
c566
c568
c569
c570
c572
c573
c57 4
c575
c576
c578
c579
c580
c581
8
16
10
14'I
14
16
20
20
24
)
1
5
1
1
6
1
2
14
1
1
6
1
6
Behind under-dash fuse/relay box
Behind under-dash fuse/relay box
Left side of steering wheel
Left side of steering wheel
Left side of steering wheel
Above under-dash fuse/relay box
Above under-dash fuse/relay box
Driver's door
Behind left kick panel
Behind left kick panel
Behind left kick panel
Left side offloor
Left quaner panel
Fueltank
On left half of rear cross beam
On left half of rear cross beam
Left quarter panel
Left quarter panel
Left quarter panel
Left quarter panel
Left quarter panel
Left quarter panel
On left half of rear cross beam
Right quarter panel
Right quarter panel
Left quarter pillar
Left side of floor
Left B-piller
Left B-piller
Behind left kick panel
Behind left kick panel
Under left side of dash
Left B-piller
Fueltank
Left side of steering wheel
Under-dash fuse/relay box (C921)
Under-dash fuse/relay box (C923)
Power mirror switch
Power window master switch
Power window master switch
Dashboard wire harness {C505)
Dashboard wire harness 1C505)
Driver's door wire harness (C661)
Main wire harness (C403)
Main wire harness (C404)
Main wire harness (C404)
Driver's seat belt switch
Left rear door switch
Fuel unit
Left rear ABS wheel sensor
Left rear ABS wheel sensor
Rear accessory socket connector {+}
Rear accessory socket connector (-)
Rear bumper wire harness 1C641)
Trailer lighting connector
Tailgate door latch switch
Left rear speaker
Right rear ABS wheel sensor
Rear wire harness (C611)
Right rea. door switch
Left taillight
Parking brake switch
Left rear door wire harness (C681)
Driver's door switch
Select unlock relay (for security alarm
system)
Junction connector (for power door
locks)
SRS main harness (C807)
Driver's seat belt tensioner
Fuel tank pressure sensor sub-harness(c645)
Power window master switch
'97 - 98
mooets'99 - 00
models
'97 model'98 - 00
models
Optional
'97 model'98 - 00
models
'98 - 00
mooets'98 - 00
models'98 - 00
mooets'99 - 00
mooets
G551
G553
Behind left kick panel
Left side ot floor
Left quarter piller
Body ground, via left side wire harness
Body ground, via left side wire harness
Body ground, via left side wire harness
23-26
www.emanualpro.com

Description
J)
The SRS is a safety device which, when used in conjunction with the seat belt, is designed to help protect the driver and
front passenger in a frontal impact exceeding a certain set limit. The system consists of the SRS unit (including safing sen-
sor and impact sensor), the cable reel, the driver's airbag and front passenger's airbag.
Seat Bolt Tensioner {'98 - 00 models}
The seat belt tensioner is linked with the SRS airbags to further increase the effectiveness of the seat belt. In a front-end
collision, the tensioner instantly retracts the belt firmly to secure the occupants in their seats
FRONT PASSENGER'SAIREAGDRIVER'S AIRBAG
FRONT PASSENGER'SSEAT BELT TENSIONER{'98 - 00 modelsl
)
SRS UNITDRIVER'S SEAT BELTTENSIONER l'98 - 0O modeb)
Operation
The main circuit in the SRS unit senses and judges the force of impact and, if necessary, ignites the intlator charges. lf bat
tery voltage is too low or power is disconnected due to the impact, the voltage regulator and the back-up power circuit
respectively will keep voltage at a constant level.
For the SRS to operate:
(1) The impact sensor must activate, and send electric signals to the microprocessor.
(2) The microprocessor must compute the signals, and send them to the airbag inflators (and seat belt tensioners).
(3) The inflators must ignite and deploy the airbags (and activate the tensioners).
Selt-diagnosis System
A self-diagnosis circuit is built into the SRS uniU when the ignition switch is turned ON (ll), the SRS indicator Iight comes
on and goes off after about six seconds if the system is operating normally.
lf the light does not come on, does not go off after six seconds, or it comes on while driving, it indicates an abnormality in
the system. The system must be inspected and repaired as soon as possible.
For battery serviceability, the memory will store the cause of the malfunction, and the data link circuit passes on the infor
mation from the memory to the data link connector (DLC). This information can be read with the Honda PGM Tester con-
nected to the DLC {16P).
198
---__-l
TENSTO1En II
_-___J- 00 N4ode s)
24-17
www.emanualpro.com